Download presentation
Presentation is loading. Please wait.
Published byMatilda Watson Modified over 8 years ago
1
Results from Fluka Studies Updates since Imperial Meeting Problems encountered Solutions Results Misc. Next Steps
2
Simulation Progress in UK Updates since Amsterdam: Geant3/4 Comparisons Luminosity Spectrum Mokka Fluka Misc. Next Steps Work of: David Ward, Chris Ainsley, George Mavromanolakis, Stewart Boogert, NKW
3
Manchester, 2/10/2003Nigel Watson / CCLRC-RAL & Birmingham3 G3/G4 Studies, TDR geometry Gheisha problems affecting baryons 5 bugs had been independently reported by Cassel and Bower (SLAC) to CERN Affected mesons also, but less significant Fixes for some (not all!) implemented in G4 Preliminary studies with antiprotons indicate discrepencies in HCAL between Geant versions, agreement at ~10% level
4
Manchester, 2/10/2003Nigel Watson / CCLRC-RAL & Birmingham4 G3/G4 Studies, Prototype For TDR geometry, mokka writes G4 G3 code “out of the box” Extend this to prototype models OK for HCAL (same geometry driver in TDR and prototype) Different driver (proto01) for ECAL Attempt to implement, replaced use of G4VPlacement by (mokka analogue) MyPlacement Difficulties with CellMap routine Prototype does not have standard module-stave structure Wrote replacement for CellMap “by hand” Not entirely general, but seems to work
5
Manchester, 2/10/2003Nigel Watson / CCLRC-RAL & Birmingham5 First Prototype Results in G3 mokka prototype G3 and embedded in Brahms ECAL and HCAL Geometry looks OK e.g. 5 GeV , normal incidence
6
Manchester, 2/10/2003Nigel Watson / CCLRC-RAL & Birmingham6 First Prototype Results in G3 Zoom on ECAL Looks reasonable, move on to more quantitative studies Compare G3/G4 using 5 GeV e , ,
7
Manchester, 2/10/2003Nigel Watson / CCLRC-RAL & Birmingham7 5 GeV , e 5 GeV E HCAL /E total e 5 GeV e E HCAL /E total ECALHCAL transverse longitudinal
8
Manchester, 2/10/2003Nigel Watson / CCLRC-RAL & Birmingham8 5 GeV Distributions as expected Encouraging so far 5 GeV E HCAL /E total ECALHCAL transverse longitudinal
9
Manchester, 2/10/2003Nigel Watson / CCLRC-RAL & Birmingham9 Hadron Endcap mokka G3 interface not implemented in endcap Uses (general) G4Polyhedra volumes, no code to write out equivalent G3 geometry Code added to MyPlacement.cc, adapted from G3 PGON volume Appears to be working
10
Manchester, 2/10/2003Nigel Watson / CCLRC-RAL & Birmingham10 HCAL Endcap Geometry Demo Whole detector Focus on endcap region
11
Manchester, 2/10/2003Nigel Watson / CCLRC-RAL & Birmingham11 Luminosity Spectrum Progress: large discrepancy in dL/d s of March CALICE meeting now understood: FSR had not been included in calculation of true s Required to unfold cross- section data e.g. for precise m t measurement Use wide angle Bhabha 100-450mrad) in main calorimeters, tracker Deduce s’ from acolinearity Need, for ~ beam energy particles, good especially in endcaps use GUINEA-PIG (beam dynamics)+BHWIDE linked to LC-ABD work
12
Manchester, 2/10/2003Nigel Watson / CCLRC-RAL & Birmingham12 Resolution Studies Based on samples of 5k single e model TDR/D09M1 , two regions 10 0 – 170 0 (whole detector) 6 0 -35 0 (endcap only) energies: 5, 7.5, 10, 15, 20, 50, 100 GeV flat angular distribution from origin
13
Manchester, 2/10/2003Nigel Watson / CCLRC-RAL & Birmingham13 Energy Resolution LC-DET/2001-058 bias and resolution worse at higher energy leakage? Calorimeter resolution stochastic ~ 14% constant ~ 4% cf. TDR (11%, 1%) energy / GeV single electron energy resolution, single electron energy resolution, ● whole detector ● endcap only mean bias in reconstructed energy bias resolution
14
Manchester, 2/10/2003Nigel Watson / CCLRC-RAL & Birmingham14 Angular Resolution Use energy weighted angles Excellent polar angle resolution (<10 -3 ) assuming originates from IP Achieved well below 175GeV (beam energy for m t measurement) single electron angular resolution, single electron angular resolution, energy / GeV mean bias in reconstructed angle ● whole detector ● endcap only
15
Manchester, 2/10/2003Nigel Watson / CCLRC-RAL & Birmingham15 AimAim Systematic comparison between Mokka and Fluka implementation of test beam configuration Particularly interesting for hadronic interactions See DRW’s Geant studies Want flexibility to Adapt to new mokka detector models Investigate full TDR type geometry Original problems Fluka geometry defined by data cards Only limited geometrical structures supported Repeated structures at 1 level only
16
Manchester, 2/10/2003Nigel Watson / CCLRC-RAL & Birmingham16 MethodMethod [From ATL-SOFT-98-039] Geomety and physics decoupled in G4 and Fluka Wrappers for f77/C++ Fluka authors’ tests Simple detectors Identical results Fluka,Fluka+G4 T36 calorimeter: 81 layers Pb (10mm)-scint.(2.5mm) Consistent results My first test Use T36 calorimeter as above
17
Manchester, 2/10/2003Nigel Watson / CCLRC-RAL & Birmingham17 (Missing!) replicated volumes… User routine callable when boundary between volumes detected during tracking a particle G4 replica or parametrised volumes Fluka “lattice volumes” Not seen during tracking Repeated placement of identical G4 physical volumes are seen Solution (from Flugg author) Use rudimentary drawing routine, gives user control at each step in tracking Ambiguity in region index (3x tower stacks, and 5 detector slabs corresponding to same thickness of W plate) no longer problematic Fluka Issues
18
Manchester, 2/10/2003Nigel Watson / CCLRC-RAL & Birmingham18 Volume Ambiguity fluka ‘sees’ 3x32 Si volumes id for wafers degenerate in z (x3 towers) in y within a stack of 5 detector slabs (10 Si layers)
19
Manchester, 2/10/2003Nigel Watson / CCLRC-RAL & Birmingham19 Current Status Mokka running within flugg/Fluka framework Using Mokka-01-05 + Geant4.5.0.p01 + clhep1.8.0 + gcc3.2 Flugg05 (Jan. 2003) Fluka 2002.4 (end May 2003) Procedure: start from Mokka release and remove: all classes except for detector construction, detector parametrisation, magnetic field construction corresponding #include, variable, class definitions in.cc/.hh anything related to G4RunManager, DetectorMessenger code where SensitiveDetector is set interactive code, visualisation, etc. Some (…) difficulties to ensure completely consistent libraries minimal debugging tools in Fluka if (when) things go wrong No idea what was wrong with P55 model (no errors from G4 geometry debugging tools, yet fluka consistently crashes). Now using ProtEcalHcalRPC model, works
20
Manchester, 2/10/2003Nigel Watson / CCLRC-RAL & Birmingham20 Fluka with G3/G4 ECALHCAL transverse longitudinal e 5 GeV e E HCAL /E total In these plots, fluka has energy deposited in all material, not just active layers
21
Manchester, 2/10/2003Nigel Watson / CCLRC-RAL & Birmingham21 Fluka with G3/G4 ECALHCAL transverse longitudinal 5 GeV E HCAL /E total ECALHCAL transverse longitudinal In these plots, fluka has energy deposited in all material, not just active layers
22
Manchester, 2/10/2003Nigel Watson / CCLRC-RAL & Birmingham22 Fluka with G3/G4 ECALHCAL transverse longitudinal 5 GeV E HCAL /E total In these plots, fluka has energy deposited in all material, not just active layers
23
Manchester, 2/10/2003Nigel Watson / CCLRC-RAL & Birmingham23 Ongoing Work Restrict study to energy deposited in active layers (trivial and will make faster) All material (ECAL+HCAL), 2k takes ~ 5 hr Silicon layers only, 2k takes ~ 20 min. Increased speed, find abort in G4Navigator:ComputeStep ~ 5k events (precision of location) Digest very recent distributions Fix errors ( at least appear in G4 not fluka -may arise from fluka settings) Review energy thresholds (also possible to define step size) in Fluka default min. K.E. 100 keV neutrons, 19.6 MeV energy e/ 500 keV (??) low energy neutron cross-section PEMF, etc., Compare systematically with G3/G4 results, e.g. primary incident at same position thresholds, mip normalisation, etc. Should extract information using CGA to Mokka format ~contained within detector slab?
24
Manchester, 2/10/2003Nigel Watson / CCLRC-RAL & Birmingham24 Misc.Misc. calice2root converts ASCII.kin,.step,.hits files, merged and compressed, into root format easily converted into LCIO, fortran binary, etc. simple objects/struct for individual hits, tracking steps, truth hits works with both full and prototype detector CGA experience, input to clustering algorithm use to extract necessary info. for reconstruction difficulty with prototype, stops tracking in RPC HCAL
25
Manchester, 2/10/2003Nigel Watson / CCLRC-RAL & Birmingham25 OrganisationOrganisation People working at different sites, try to reduce technical effort by creating common “reference” repository for shared s/w /afs/rl.ac.uk/calice (world readable) flugg flukka io (data storage and object persistancy) java (just for lcio) mokka recon (calorimeter reconstruction) run-scripts (pbs and local run scripts) tools (3D viewers etc) G4, CLHEP from cern afs Allows mokka to be run on RAL CSF, or remotely (compiler permitting) Details under “UK simulation” from http://www.hep.ph.ic.ac.uk/~calice/ http://www.hep.ph.ic.ac.uk/~calice/ Several of us also now involved in LC accelerator studies (beam delivery system, machine detector interface)
26
Manchester, 2/10/2003Nigel Watson / CCLRC-RAL & Birmingham26 Local MySQL db From Gabriel Musat last week mysqldump –A –h aldeberan.in2p3.fr –u consult –p >mylocal.out edit mylocal.out (emacs), remove few mysql definitions find local machine with mysql demon running issue mysql –u local_use –p <any.mysql where any.mysql defines where edited mokka db is local server will then retain copy of your mokka db modify Control.cc to redefine server, or try cmd line options to mokka Tried 1 st two steps. I will put prescription & examples of before/after edits on web or calice UK afs
27
Manchester, 2/10/2003Nigel Watson / CCLRC-RAL & Birmingham27 Summary & Future Plans Good progress in all areas Cambridge starting to look at energy flow algorithms and impact of MC modelling on them Study clustering, lumi. spectrum Continue G3/G4 studies with prototype geometry, and also HCAL endcap in full detector – George M. starting to take over here, validate changes, update to latest versions of code. Continue fluka work now we have first real results using mokka prototype Consider test beam programme/strategy
Similar presentations
© 2024 SlidePlayer.com Inc.
All rights reserved.